From: LCD 47 <lcd047@gmail.com>
To: git@vger.kernel.org
Subject: DNS issue when cloning over HTTP and HTTPS
Date: Tue, 18 Jun 2013 01:23:56 +0300 [thread overview]
Message-ID: <20130617222356.GA22255@admin.romednet.com> (raw)
The following snippet illustrates the problem:
$ uname -srvm
Linux 3.9.5-smp #2 SMP Mon Jun 10 02:54:26 CDT 2013 i686
$ git --version
git version 1.8.3
$ git clone https://github.com/torvalds/linux.git
Cloning into 'linux'...
fatal: unable to access 'https://github.com/torvalds/linux.git/': Could not resolve host: github.com (Could not contact DNS servers)
Of course, DNS is working fine, and GitHub is accessible from my
machine:
$ dig github.com
; <<>> DiG 9.9.2-P2 <<>> github.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 20305
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 4, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;github.com.INA
;; ANSWER SECTION:
github.com.212INA204.232.175.90
;; AUTHORITY SECTION:
github.com.79055INNSns1.p16.dynect.net.
github.com.79055INNSns2.p16.dynect.net.
github.com.79055INNSns3.p16.dynect.net.
github.com.79055INNSns4.p16.dynect.net.
;; Query time: 0 msec
;; SERVER: 192.168.7.2#53(192.168.7.2)
;; WHEN: Tue Jun 18 00:46:13 2013
;; MSG SIZE rcvd: 141
$ ping -c 3 github.com
PING github.com (204.232.175.90) 56(84) bytes of data.
64 bytes from github.com (204.232.175.90): icmp_req=1 ttl=52 time=142 ms
64 bytes from github.com (204.232.175.90): icmp_req=2 ttl=52 time=140 ms
64 bytes from github.com (204.232.175.90): icmp_req=3 ttl=52 time=154 ms
--- github.com ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2001ms
rtt min/avg/max/mdev = 140.184/145.555/154.217/6.183 ms
$ nc -v github.com https
github.com [204.232.175.90] 443 (https) open
^C
A packet capture shows what's going on: Git tries to resolve
github.com over LLMNR rather than DNS, and my router responds with
"destination unreachable". 192.168.7.2 is my machine, and 192.168.7.1
is my router:
No. Time Source Destination Length Expert Protocol Info
1 0.000000 192.168.7.2 192.168.7.1 70 LLMNR Standard query 0xbfe4 A github.com
Frame 1: 70 bytes on wire (560 bits), 70 bytes captured (560 bits)
Ethernet II, Src: IntelCor_94:18:a4 (00:1c:c0:94:18:a4), Dst: 22:4e:7f:5b:02:55 (22:4e:7f:5b:02:55)
Internet Protocol Version 4, Src: 192.168.7.2 (192.168.7.2), Dst: 192.168.7.1 (192.168.7.1)
User Datagram Protocol, Src Port: 55585 (55585), Dst Port: 13568 (13568)
Source port: 55585 (55585)
Destination port: 13568 (13568)
Length: 36
Checksum: 0x8f89 [validation disabled]
[Good Checksum: False]
[Bad Checksum: False]
Link-local Multicast Name Resolution (query)
Transaction ID: 0xbfe4
Flags: 0x0100 Standard query
Questions: 1
Answer RRs: 0
Authority RRs: 0
Additional RRs: 0
Queries
github.com: type A, class IN
Name: github.com
Type: A (Host address)
Class: IN (0x0001)
No. Time Source Destination Length Expert Protocol Info
2 0.000254 192.168.7.1 192.168.7.2 98 ICMP Destination unreachable (Port unreachable)
Frame 2: 98 bytes on wire (784 bits), 98 bytes captured (784 bits)
Ethernet II, Src: 22:4e:7f:5b:02:55 (22:4e:7f:5b:02:55), Dst: IntelCor_94:18:a4 (00:1c:c0:94:18:a4)
Internet Protocol Version 4, Src: 192.168.7.1 (192.168.7.1), Dst: 192.168.7.2 (192.168.7.2)
Internet Control Message Protocol
Type: 3 (Destination unreachable)
Code: 3 (Port unreachable)
Checksum: 0x8c86 [correct]
Internet Protocol Version 4, Src: 192.168.7.2 (192.168.7.2), Dst: 192.168.7.1 (192.168.7.1)
User Datagram Protocol, Src Port: 55585 (55585), Dst Port: 13568 (13568)
Source port: 55585 (55585)
Destination port: 13568 (13568)
Length: 36
Checksum: 0x9684 [validation disabled]
[Good Checksum: False]
[Bad Checksum: False]
Link-local Multicast Name Resolution (query)
Transaction ID: 0xbfe4
Flags: 0x0100 Standard query
Questions: 1
Answer RRs: 0
Authority RRs: 0
Additional RRs: 0
Queries
github.com: type A, class IN
Name: github.com
Type: A (Host address)
Class: IN (0x0001)
Cloning with the git protocol works as expected.
A search on the net shows people having the same problem more than
an year ago, and the solution there seems to imply that Git can't cope
with async DNS in curl:
http://osdir.com/ml/freebsd-ports-bugs/2012-05/msg00095.html
Any idea?
/lcd
PS: Please CC me on replies, as I'm not subscribed to this list.
next reply other threads:[~2013-06-17 22:37 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-17 22:23 LCD 47 [this message]
2013-06-17 22:45 ` DNS issue when cloning over HTTP and HTTPS Daniel Stenberg
2013-06-17 23:11 ` LCD 47
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